As commendant of the People's Militsiya after the 1944 coup d'état, he personally, willingly and methodically killed officers, intellectuals and public figures.

There was a possibility that he would venture out with the detachment of Naum Yosifov in Macedonia, but was left behind because of his studies on duty along the IMRO border in Sofia.

Along with Pero Shandanov, Petso Traikov and Krustan Poptodorov, they organized assaults against activists alined with Ivan Mihailov.

One theory claims that his amnesty is connected with his agreement to cooperate with the secret police, for which he was personally recruited by Nikola Geshev.

[7] Come early 1941 he sympathized with the German forces, which led to him an embroiled relationship with Petar Shandanov,[8] but after the attack on the USSR, he leaned towards the left and participated in the Bulgarian partisan movement.

[10] After the 1944 coup d'état, he actively participated in the communist-backed terrorization of the country, and later in the operations of the First Bulgarian Army against the Third Reich, for which he was promoted to the rank of colonel.

[11] He propagated the ideas of Macedonism and of a Balkan Federation, visiting Skopje in relation to installing the so-called "cultural autonomy" in Pirin.

During the August 1946 trials of prominent members of the IMRO in Sofia, Glavinchev served as the main witness of the prosecutor.

[6] He was imprisoned for a second time in 1951 for 5 years, for accepting bribes and illegally transporting Bulgarian citizens across the border, who were then killed and their corpses robbed.

During the investigations, he testified to his involvement with police during the manhunt of communists Ivan Minkov and Hristo Koydzhekov following the St Nedelya Church assault in 1925.